CS-YODAS: A Mined Dataset of In-the-Wild Code-Switched Speech

Brian Yan; Qingzheng Wang; Matthew Wiesner; Anuj Diwan; Olga Iakovenko; Alexander Polok; Injy Hamed; Shuichiro Shimizu; Iris Emerman Thomas Hain; David R. Mortensen; Peter Viechnicki; Shinji Watanabe

arXiv · 2606.11514

CS-YODAS: A Mined Dataset of In-the-Wild Code-Switched Speech

Brian Yan·Qingzheng Wang·Matthew Wiesner·Anuj Diwan·Olga Iakovenko·Alexander Polok·Injy Hamed·Shuichiro Shimizu·Iris Emerman Thomas Hain·David R. Mortensen·Peter Viechnicki·Shinji Watanabe

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Abstract

We present CS-YODAS, a Creative Commons-licensed dataset of in-the-wild code-switched speech mined from multilingual YouTube data. Code-switching (CS), or the alternation between languages within an utterance or conversation, is common in multilingual settings but remains underrepresented in existing CS speech resources, which are typically small, domain-specific, or artificially constructed. Building on the YODAS corpus, we develop a scalable, human-in-the-loop pipeline for identifying and validating naturally occurring code-switching. The resulting dataset, which totals 313 hours and spans 7 matrix languages, provides diverse, real-world examples of spontaneous code-switched speech. We further analyze the distribution and characteristics of code-switching in the wild, examining language-pair frequencies and switching patterns, and report baseline results for spoken language identification. We hope that CS-YODAS will encourage broader and more comprehensive research on code-switched speech. Dataset link: https://huggingface.co/datasets/byan/cs-yodas.

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Brian Yan, Qingzheng Wang, Matthew Wiesner, Anuj Diwan, Olga Iakovenko, Alexander Polok, Injy Hamed, Shuichiro Shimizu, Iris Emerman Thomas Hain, David R. Mortensen, Peter Viechnicki, Shinji Watanabe. 2026-06-09. CS-YODAS: A Mined Dataset of In-the-Wild Code-Switched Speech. https://arxiv.org/abs/2606.11514

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